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While working on tracking down a nasty synchronization bug
I could keep all the data flows and puzzle pieces together
in my mind, so I wrote some of them down as best as I was
understanding them.
Further I refactored some code because I find the terser
styles afforded by ES2015+ syntax to confuse me less,
especially when following around closures with
bind
andcall
andapply
The point isn't to change behaviors here but to figure them
out and write them down. That is, there should be no
functional changes in this patch and if there are then it's
probably a bug.